George J. Nesbitt
  • Emeryville, CA
  • United States
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Duct Testing High Velocity Systems
2 Replies

Dose anyone have experience testing high velocity duct systems?I've been asked to duct test a Zhender HRV with comfoducts (2" homerun ducts).I designed & installed a hydronic high velocity system…Continue

Started this discussion. Last reply by Paul Morin Jan 10, 2013.

 

George J. Nesbitt's Page

Latest Activity

George J. Nesbitt replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Historically we have done an air barrier on the inside, lot's of intersections, penitrations, discontinuities, easier to damage, etc. Many of us decided that it would be easier to do the air barrier on the outside. Many still talk about air…"
May 15
George J. Nesbitt replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"While code may not require adding ventilation to an existing kitchen, I would never air seal & insulate a house without adding it (or at least recommending it). If you remodel a kitchen it should be required. As for the AAV's they would be…"
May 15
George J. Nesbitt replied to Dmitri A Martin's discussion Square Recessed Lights
"Can you create an air barrier (5/8" drywall or 1/2" ply) at the ceiling level? eliminating the soffit, and the need to air seal, baffel, and insulate around the fixture?"
May 4
George J. Nesbitt replied to Kaushal Bharath Raju's discussion On the Question of Airtightness and Energy Performance
"1) not important; air leakage can introduce pollutants to the building (dust, moisture, gases, etc.). Moisture can damage a building when it condenses on surfaces, and you get mold, or rots. High indoor RH (relative humidity) can increase off…"
Apr 30
George J. Nesbitt replied to Luis Hernandez's discussion Air Source Heat pump or mini-split efficiency
"Equipment is rated for it's configuration (ducted or ductless). So you can compare equipment efficiencies directly. However, a ductless system has no distribution losses. A ducted system would have losses if the ducts are in unconditioned…"
Apr 30
George J. Nesbitt replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Sorry, I meant to say NOT recognized."
Apr 30
George J. Nesbitt replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"AAV's are recognized in the state plumbing code, although they are in the IRC (international residential code, not sure about the UPC, universal plumbing code). Not sure if any city's in CA allow them outright. I know of a PH project in…"
Apr 30
George J. Nesbitt replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"CA modifies the National / International codes, and does not allow some things, but does others. Each City / County has to adapt the CA code, but not always everything. City / Counties can adopt stricter standards. Code often lags behind what we…"
Apr 30
George J. Nesbitt replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"I've done a recirculating hood with an ERV in Berkeley, the city did not notice."
Apr 30
George J. Nesbitt replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"The owners (like Alice) have had varying degrees of involvement, mainly on the planning (research) side. I don't have any direct involvement or knowledge of local projects (that would be good examples) that were heavy sweat equity. Most of the…"
Apr 27
George J. Nesbitt replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"The is a project in Larkspur CA that did an exterior retrofit. They air sealed the existing plywood siding, added continuous rigid rockwool insulation, furring strips (rain screen) and new siding. The roof was stripped, new osb for air sealing…"
Apr 26
George J. Nesbitt replied to Kaushal Bharath Raju's discussion Affordability & Deep Energy Upgrade/Passive House Retrofit in Berkeley, California.
"Plan, plan, plan, plan. The 1st step to is to understand the house, how it's built, the systems, the condition, etc. You need to look at what you want to do, and what needs to be done. You can than come up with options, do some cost estimating,…"
Apr 19
George J. Nesbitt posted an event

High Performance Windows - A Panel of Experts at Pyramid Alehouse`

April 26, 2014 from 3pm to 5pm
Join a lively panel discussion on high performance windows. We'll cover some basics, as well as diving into in-depth technical details. Some of the topics we'll explore include frame performance (e.g. whats the impact of a warm edge spacer?), glazing performance (e.g. balancing solar gains and u-value), certifications (e.g. what the process and testing for PH certifications) as well as practical questions around installation concerns, lead times, etc. Bring your burning questions as the…See More
Apr 19
George J. Nesbitt replied to Rich Johnson's discussion Elec Coil heat vs Heat Pump
"Adding electric resistance coils in the ducts would likely have caused the problem discussed in the post; How Do We Make Energy Efficiency Sexy, or at Least Interesting? With your customer ending up with a higher electric bill. Adding Solar often…"
Aug 22, 2013
George J. Nesbitt replied to Bachi Brunato's discussion Need Help Decoding a Couple of Nameplates
"Are you trying to figure out the age, or the efficiency? "
Aug 22, 2013
George J. Nesbitt replied to Bachi Brunato's discussion Extraordinarily High CO Reading on a Furnace Vent: 3950 PPM
"A cracked heat exhanger would not cause high CO (unless it affected the operation of the flame). A cracked heat exhanger might allow the CO into the house, did you check ambient & a supply register for CO? High CO can mean a burner needs…"
Aug 22, 2013

Profile Information

Company
Environmental Design / Build
Professional Certification
MADD Building Scientist
Website URL
http://houseisasystem.com

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At 6:02am on December 16, 2012, Diane Chojnowski said…

Hi George,

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the place for you!

Don't forget to upload your profile photo. And add your location on our Member Map!


Thanks!
Diane, HEP Moderator

 
 
 

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